They by their own admission to LE, they (former homicide and nurse) know what a dead body smells like. They knew the car smelled like a dead body and what that meant. Before calling LE, they drove the car home, hid it in their garage and removed and cleaned items from the car that they knew was a crime scene.
I think we are losing sight of what the A's 'could' be charged with if LE is inclined to do so - as SuziQ here has stated they, as a prior LE and a nurse knew what the smell of death was - first George did not call LE when he went to pick up the car from the two yard - okay we can dismiss that, they were frantic trying to find Caylee and Casey at the time - then Cindy takes out the stuff from the car knowing full well what it smelled like, washed the pants and knife, put the toys out back - okay we can dismiss that she was frantic also - THEN George proceeded to clean the truck - we cannot dismiss that - I'm sorry they tried to air out the car and they knew what death smelled like - THAT is when Cindy tracked Casey down and demanded to know where Caylee was and we started the circus with the 911 call.
THEN we have Cindy not giving items to LE as requested because she told them there was nothing for them - doesn't matter - LE needed it, Cindy did not hand it over - credit card statements, medical records
THEN Cindy changes her story to LE AND at bond trial - that IS punishible by law, LE dismisses it, they aren't done with Cindy yet
THEN Cindy has been recorded by LE as to arguing and talking to supenoa'd witnesses for trial - tow truck driver told LE that Cindy went back and argued with him and the friends of Casey told LE that she talked to all of them
THEN Cindy and George won't assist in searches condoned and sponsored by LE - i.e. Equasearch
THEN we see the email about the hairbrush - with this I'm sure there are more emails to follow
I'm sure nothing would have been done UNTIL the body was found and items from the house are found with the body - then LE gets the supenoa to get items from the house in which they took the computers again and a bunch of other stuff
It went past the frantic grandparents to ones trying to stop an investigation